mission idea "Spacecraft"

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I post mission idea "Spacecraft".
I would like to get some feedback.

description :
You have to plan unmanned spacecraft touch down on the asteroid and return to Earth.

You are given propellants, batteries and position of the asteroid.
Spacecraft consume 1 propellant by each acceleration.
Batteries mean time(step) limit.
Earth's position is always 0 and spacecraft start from Earth.

At each step, spacecraft can accelerate positive( or negative ) direction.
if spacecraft position is equal to the asteroid or Earth, he touch down or return.
(When last of each step, evaluate spacecraft position)

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